How to calculate atomic mass

Using data from seismic waves, geologists have learned that earth’s interior is made up of several

Aroom with dimensions 7.00m×8.00m×2.50m is to be filled with pure oxygen at 22.0∘c and 1.00 atm. the molar mass of oxygen is 32.0 g/mol. how many moles noxygen of oxygen are required to fill the room? what is the mass moxygen of this oxygen?

Why does a plastic bottle that is sealed at a high altitude change it’s shape when taken to lower altitude